Steel packers with double-casing OPD

Packer OPD is steel packer consisting of inner long screw with sealing rubber and distance tube with nut. Packer might be ended with a screw with outer thread or nipple ball-head or flat-head (hexagonal-PMh/round-PMk). Disassembling of the packer is done by cutting the extra part of the packer off or by loosening the nut by the distance tube and removing the whole packer out of the bore hole.